No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $3M — a different platform, not this one.

The Swapper

Holder of numerous awards and accolades, the Swapper is an atmospheric puzzle platformer set in the furthest reaches of space. Players wield an experimental device able to clone the user and swap control between them. Dropped into a character and world as mysterious as the workings of the device itself, The Swapper is a game of exploration of a very personal nature. All of the art in The Swapper is constructed using clay models and other everyday materials. The Swapper is supported by Indie Fund. Fiendish puzzles whose solutions are only ever a few steps away. A thought-provoking story set in an eerie sci-fi world filled with atmosphere of mystery and isolation. Narrative design from Tom Jubert, writer behind such indie hits as Penumbra and FTL. A visually stunning hand-crafted world built out of clay.